COMMENT: This Blohm & Voss dive bomber and ground attack aircraft project of 1944 was of a twin boom design with each boom having a bomb bay in the forward section capable of holding a SC 250 bomb. The aircraft was powered by two BMW 003 turbojet engines mounted side-by-side under the center nacelle in which the cockpit and armament was located. The heavy armament consisted of four fuselage mounted MG 151/20 20mm cannon. The landing gear was a conventional “tail-dragger” arrangement with extended track width. Although detail planning was in advanced stage the project was not favored by the “Technische Amt” (Technical bureau) of the RLM (Ref.: 17).

COMMENT: In 194/42 the design team of Henschel Aircraft Company proposed an advanced project of a fast light bomber and ground attack aircraft. Power was provided by a single Daimler-Benz DB 610 engine that in fact consisted of two Daimler-Benz DB 605 liquid-cooled engines, joined side-by side. The engine drove two four-bladed pusher type propellers via an extension shaft. A similar design but powered by a Daimler-Benz DB 613 was the Henschel Hs P. 75 fighter and interceptor project. Both designs were radical in so far as a canard arrangement was proposed with elevators in front and the wing positioned to the rear. By that enough space was available to integrate the wide and bulky power unit. Furthermore, a large weapon bay in the in the forward fuselage was available. The disadvantage of this arrangement is the permanent shifting of the center of gravity. Vertical fins were located at the wingtips. Intensive work was done concerning the lay-out of the cockpit in order to give the two crew members an excellent view forward. In case of emergency the cabin could be blown up in order to prevent a collision with the eight-bladed propellers. Detailed construction was in an advanced stage when the RLM refused this project with the flimsy comment “… the pilots couldn’t acclimatize with a propeller in the back and the elevators in front”. So further work on this project was stopped (Ref.: 16, 17).

COMMENT: In early 1941 the OKL asked for a possible successor for the Messerschmitt Me 110 heavy fighter. Among others the Henschel Aircraft Company proposed a design of a futuristic and unusual configuration. This design, the Hs P.75, featured a tapered fuselage with slightly swept-back wings set back to the rear fuselage of the aircraft and a pair of slightly swept-back canards located on the nose. The widened fuselage housed a powerful engine that drove three-bladed contra-rotating pusher propellers at the rear via an extension shaft. As power unit a Daimler Benz DB 610 engine, which were two DB 605 liquid-cooled engines joined side-by-side, was proposed. These were the same engines that the Heinkel He 177 bomber used and became known for overheating and catching fire. So it was decided to install the Daimler Benz DB 613, in fact two coupled DB 603 liquid-cooled engines, rated at 3,500 hp. A vertical tail unit was mounted beneath the fuselage additionally functioning as a tail bumper and protected the propellers from stroking the ground during take-off. A tricycle landing gear arrangement was chosen and a single pilot sat in the cockpit located about midway along the fuselage. All weapons were mounted in the nose. The advantage of the pusher propeller and the forward canard design was the excellent view of the pilot and concentration of weapons in the nose. The disadvantage would be the engine cooling and the pilot’s safely exit in case of emergency. Although good results were obtained in wind tunnel testing this design was not followed up further.
Notable is the fact that this basic design was realized in several WW II aircraft design such as Curtiss XP-55 “Ascender” and Kyushu J7W1 “Shinden” (Ref.: 17).

COMMENT: Early in 1943, the RLM issued a specification for a single-seat attack aircraft to combat the anticipated Allied invasion in Europe. Although the specification called for a piston-engine powered dive bomber it was soon realized that only a turbojet-driven aircraft could hope to match the proposed performance requirements. The Henschel Company submitted a design which was approved as Henschel Hs 132 and placed accent of simplicity and ease to manufacture. The wing was a wooden structure with plywood skinning, and the fuselage was a circular metal monocoque. The single turbojet was mounted above the fuselage, exhausting over the rear fuselage and between the twin vertical surfaces of the tail assembly. A tricycle landing gear was to be used and the extensively glazed cockpit was completely faired with the fuselage. The pilot was in prone position better to withstand the high G-forces of the fast and steep dive during the bomb run. It was estimated that during the dive a speed of more than 570 mph could be reached and after the bomb was released the aircraft was pulled up thus inducing acceleration forces of up to 10 G. A contract for six prototypes was placed in May 1944, and construction began in March 1945. When the war in Europe ended the Henschel Hs 132 V1 was nearly complete and captured by Soviet forces

NOTICE: To ascertain the practicability of the prone position for dive bomber pilots, the DLV ordered in early 1943 a small prone-pilot research aircraft that was designed and built by the FFG Berlin (Flugtechnische Fachgruppe/Aerotechnical Group, University Berlin) and designated Berlin B9. The design was a low winged, twin-engine aircraft of standard layout. It was built of mixed construction and could accept up to 22 G. It was flown by many experienced pilots and showed the advantages of a prone position for pilots to tolerate high g-forces. (Ref.: 17).

COMMENT: In February 1942 severe problems became obvious with the new twin-engine Messerschmitt Me 210, successor of the aging Messerschmitt Me 110. Due to longitudinal instability and lack of performance the series production was stopped and switched back to the inadequately Me 110. So Messerschmitt was forced to redesign the aircraft by lengthening the fuselage and adding more powerful engines what finally became the Messerschmitt Me 410. In the meantime a search was begun on a new design for a twin-engine heavy fighter.
Since beginning of 1939 Prof. A. Lippisch and his design staff was part of the Messerschmitt Company and was well known for many advanced and unorthodox projects. Among these was a design study, the Lippisch LiP.10, a fast, tailless, twin-engine bomber that incorporated many parts of the unsatisfactory Me 210. Independent to this Dr. Wurster from Messerschmitt’s design team was working on a similar project that officially was designated Messerschmitt Me 329. This aircraft was of tailless design and was to be constructed mainly from wood. This would save on strategic materials and keep the weight lower. The large area wing was swept back at approximately 26 degrees, and two Daimler-Benz DB 603 engines were buried in the wings, each driving a 3.4 m four-bladed pusher propeller. A large fin and rudder was mounted at the rear and a tricycle landing gear was provided. Other advanced touches included the pilot and navigator sitting tandem in a broad bubble canopy and a remote-controlled rear gun in the tail aimed via a periscope system from the cockpit. Performance comparison between the Lippisch Li P.10, the Me 329 and the Me 410 showed that the improvement of the Me 329 over the Me 410 was marginal. So development received a low priority, and while a full-scale glider mock-up was tested in the winter of 1944/5, work on the project was cancelled shortly after (Ref.: 16, 17).

COMMENT: This project became known through a sketch which was published in France after WW II. Probably it dates back to 1942 and suggests a possibility of the”… installation of a radial turbojet engine”. A later well-known drawing suggests that there were two configurations of the same design, the “Zerstörer-Projekt I and II”. In both the air intakes as well as the tail assembly was different. Apparently, it was planned to utilize two Junkers Jumo 004 turbojets or one Heinkel HeS 011 engine. In “Zerstörer-Projekt I” the air intake for the turbojet engines were positioned in the wing roots and the tail plane was swept sharp forward and in “Zerstörer-Projekt II” it was swept back so as the wings. Also the turbojet engine was fed by an air intake located on each side of the fuselage under the wings. To extend range, plans were made to mount two 300 liter auxiliary wingtip fuel tanks. Two Mk 108 30mm cannon were installed in the nose part. The design was not pursued (Ref.: 16, 17).

COMMENT: By autumn 1942, it was obvious that despite earlier opinions, the USAAF had every intension of building up an immense bomber force in Britain for use against Germany, mainly Boeing B-17 “Flying Fortress” and Consolidated B-24 “Liberator”. Furthermore, intelligence reports revealed that tremendous impetus was being placed behind the mass production of a larger, pressurized successor, the Boeing B-29 “Superfortress”, capable of operations at still greater speeds and altitudes. Thus, the development of fighters possessing higher combat ceilings had assumed greater urgency. Both Focke-Wulf and Messerschmitt were, therefore, asked to submit their proposals for a “Hochhleistungsjäger” (High-performance fighter), offering a substantially improved combat ceiling and amenable to adaption for a medium-to-high altitude reconnaissance-fighter role. To meet the requirements Focke-Wulf proposed the Fw 190Ra-2 and Ra-3, a variant based on the Fw 190D, and Messerschmitt offered a long-span derivative of the Me 109, the Me 155B. These submissions were accepted by the “Technische Amt” (Technical Office of the RLM) but in August 1943 it became clear that Messerschmitt was too committed with other development programmes to devote sufficient attention to the Me 155B, this being duly passed to Blohm & Voss.
Prof. Tank, director of Focke-Wulf’s design team, worked on his proposals Fw 190Ra-2 and Ra-3 that soon would receive the RLM type designations Ta 152H and Ta 152K, respectively. Tank envisaged the short-span variant as primarily a “Begleitjäger” (Escort fighter), and the long-span version as a “Höhenjäger” (High-altitude fighter). Furthermore, Tank pressed for permission to install the turbo-charged Daimler-Benz DB 603 engine in the Ta 152 fighter owing to its indisputable superiority to the Junkers Jumo 213E engine, installed in the Focke-Wulf Fw 190D, at high altitudes. The short-span Fw Ta 152C, as it was designated now, was broadly of similar aerodynamic concept to that of the Fw 190D, but was structurally an entirely new airframe. Although test flights showed excellent handling characteristics and performance and although a production order was placed in autumn 1944 the General-Luftzeugmeister Amt (Department of the Chief of Aircraft Procurement and Supply) decided on November 1944 that the highest priority had been given to four key warplanes, the Heinkel He 162, the Messerschmitt Me 262, the Arado Ar 234, and the Dornier Do 335. So all work on the Ta 152 was stopped (Ref.: 7).

COMMENT: Independent from each other the design teams of Blohm & Voss, Dornier and Focke-Wulf worked on projects with mid-mounted engines, driving pusher propellers via a long extension shaft. By that the pilot had an excellent view and a wide field of fire. Furthermore it was possible as far as a night- or bad-weather fighter was concerned to install a radar equipment. Dornier worked on the projects Do P.247 and Do 252 and Focke-Wulf on the Fw P.0310251. The Blohm & Voss team designed a ground attack/dive bomber that was similar to the Bv 192.01-01. A Junkers Jumo 213A engine drove a three-bladed pusher propeller via a very long extension shaft and a single fin and rudder was mounted beneath the fuselage to protect the propeller during take-off and landing. The wing had a straight leading edge and tapered trailing edge and a tricycle undercarriage was provided. The armament consisted of two MK 103 30mm cannon in the wings and two MG 151/20 20mm cannon on the nose sides. A bomb load up to 1,000 kg could be carried (Ref.: 17, 18).

COMMENT: The Focke-Wulf Fw 190, perhaps the most successful of Germany’s wartime fighters, was subjected to continuous development in order to keep pace with the rapidly changing requirements of the air war. Before the type had entered wide-spread service in its initial form work on adapting the basic frame to take liquid-cooled engines and improving the high-altitude capabilities was being undertaken by the Focke-Wulf design team, led by Prof. K. Tank. Work on three high-altitude interceptor variants powered by liquid-cooled engines was inaugurated almost simultaneously. The first of these was the Fw 190B with the Daimler-Benz DB 603 engine, this being followed by the similarly powered Fw 190C which featured an extended wing spanning, and the Fw 190Dm powered by the Junkers Jumo 213. The last-mentioned type proved easily most effective of the trio, development of the B- and C-series eventually being abandoned in its favour. The first prototypes began flight trial in early 1942 and shows spectacular performance. Small batches of pre-production Fw 190D-0’s and production Fw 190D-1 for service evaluation were delivered and tested during summer 1943. The Fw 190D-1 was not manufactured in large numbers, the first major production model being the Fw 190D-9 (nicknamed “Dora”; or “Langnasen-Dora” (“Long-Nose Dora“). For some unexplained reasons no sub-series suffix numerals between D-1 and D-9 were allocated, and the Fw 190D-9 was the only D-series fighter intended solely for the interception role. While these “long nose” versions gave them parity with Allied opponents, it arrived far too late in the war to have any real effect. The early production Fw 190D-9 shown here is fitted with original style cockpit canopy, most “Dora-9” fighters having a blown hood (Ref.: 11).

COMMENT: This project of a ground attack and dive bomber was one of the most unusual designs of Dr. Vogt and his team. The front part including the cockpit was completely separate from the fuselage and only held by two booms projecting from the wing leading edge. A Daimler Benz DB 603 engine, located mid-fuselage immediately behind the cockpit, drove a four-bladed propeller rotating around the fuselage. The wing had a straight leading edge and was pronounced taper on the trailing edge. The aircraft had a tricycle landing gear and was heavily armed with two MG 151/20 20mm cannon located in the nose and two MG 151/20 20mm cannon located in the twin booms that held the front part. Also up to 500 kg bomb load could be carried. This project was never realized (Ref.: 17, 18).